Silicon Anode with High Initial Coulombic Efficiency by Modulated Trifunctional Binder for High‐Areal‐Capacity Lithium‐Ion Batteries,Advanced Energy Materials

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Silicon Anode with High Initial Coulombic Efficiency by Modulated Trifunctional Binder for High‐Areal‐Capacity Lithium‐Ion Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-04-08 , DOI: 10.1002/aenm.201903110
Zeheng Li ₁ , Yaping Zhang ₂ , Tiefeng Liu ₃ , Xuehui Gao ₁ , Siyuan Li ₁ , Min Ling ₁ , Chengdu Liang ₁ , Junchao Zheng ₄ , Zhan Lin ₃

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High‐capacity electrode materials play a vital role for high‐energy‐density lithium‐ion batteries. Silicon (Si) has been regarded as a promising anode material because of its outstanding theoretical capacity, but it suffers from an inherent volume expansion problem. Binders have demonstrated improvements in the electrochemical performance of Si anodes. Achieving ultrahigh‐areal‐capacity Si anodes with rational binder strategies remains a significant challenge. Herein, a binder‐lithiated strategy is proposed for ultrahigh‐areal‐capacity Si anodes. A hard/soft modulated trifunctional network binder (N‐P‐LiPN) is constructed by the partially lithiated hard polyacrylic acid as a framework and partially lithiated soft Nafion as a buffer via the hydrogen binding effect. N‐P‐LiPN has strong adhesion and mechanical properties to accommodate huge volume change of the Si anode. In addition, lithium‐ions are transferred via the lithiated groups of N‐P‐LiPN, which significantly enhances the ionic conductivity of the Si anode. Hence, the Si@N‐P‐LiPN electrodes achieve the highest initial Coulombic efficiency of 93.18% and a stable cycling performance for 500 cycles at 0.2 C. Specially, Si@N‐P‐LiPN electrodes demonstrate an ultrahigh‐areal‐capacity of 49.59 mAh cm⁻². This work offers a new approach for inspiring the battery community to explore novel binders for next‐generation high‐energy‐density storage devices.

中文翻译：

高容量锂离子电池调制三功能粘合剂具有高初始库仑效率的硅阳极

高容量电极材料对于高能量密度锂离子电池起着至关重要的作用。硅（Si）由于其出色的理论容量而被认为是有前途的阳极材料，但是它存在固有的体积膨胀问题。粘合剂已证明可改善硅阳极的电化学性能。采用合理的粘合剂策略实现超高面积容量的硅阳极仍然是一项重大挑战。在此，针对超高面积容量Si阳极，提出了一种胶结剂化策略。硬/软调制三功能网络粘合剂（N-P-LiPN）通过部分锂化的硬聚丙烯酸为骨架，部分锂化的软Nafion作为缓冲剂，通过氢结合作用构造而成。N-P-LiPN具有很强的附着力和机械性能，可以适应Si阳极体积的巨大变化。此外，锂离子通过N-LiPN的锂化基团转移，这大大提高了Si阳极的离子电导率。因此，Si @ N-P-LiPN电极可实现最高的初始库仑效率，为93.18％，并且在0.2 C的温度下可在500个循环中保持稳定的循环性能。特别地，Si @ N-P-LiPN电极表现出超高的面积容量49.59 mAh厘米⁻²。这项工作为激发电池界探索下一代高能量密度存储设备的新型粘合剂提供了一种新方法。

更新日期：2020-04-08

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